GB2245725A - Non-contact IC card with power-saving - Google Patents

Non-contact IC card with power-saving Download PDF

Info

Publication number
GB2245725A
GB2245725A GB9024781A GB9024781A GB2245725A GB 2245725 A GB2245725 A GB 2245725A GB 9024781 A GB9024781 A GB 9024781A GB 9024781 A GB9024781 A GB 9024781A GB 2245725 A GB2245725 A GB 2245725A
Authority
GB
United Kingdom
Prior art keywords
card
external device
circuit
cpu
clock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9024781A
Other versions
GB9024781D0 (en
GB2245725B (en
Inventor
Shuzo Fujioka
Toshiyuki Matsubara
Shigeru Furuta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB9024781D0 publication Critical patent/GB9024781D0/en
Publication of GB2245725A publication Critical patent/GB2245725A/en
Application granted granted Critical
Publication of GB2245725B publication Critical patent/GB2245725B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • G06K19/0702—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including a battery
    • G06K19/0705—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including a battery the battery being connected to a power saving arrangement
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computing Systems (AREA)
  • Credit Cards Or The Like (AREA)
  • Power Sources (AREA)

Abstract

In a non-contact IC card, when the card is in a standby mode of operation, a CPU 31 provides a command to inhibit the application of a clock 2 to digital circuitry 3 including the CPU and/or to inhibit the application of an operating voltage to analog circuitry, 4, except for an antenna circuit 42 and a trigger signal demodulating circuit, 41, so that power consumption in the standby mode is reduced. For transfer of data between the IC card and an external device, a trigger signal derived by demodulating received data in the trigger signal demodulating circuit is used to cause the application of the clock to said digital circuitry and the application of the operating voltage to the entire analog circuitry to be resumed. <IMAGE>

Description

NONCONTACT IC CARD ' i.1 This invention relates to a non-contact IC card
with no contact terminals and more particularly to a non-contact IC card which consumes little power when transfer of data between the IC card and an external device is not effected.
BACKGROUND OF THE INVENTION
Figure 1 schematically shows an internal structure of a conventional noncontact IC card. In Figure 1, an oscillator circuit 1 generates a clocking oscillation signal 2 which is applied to a CPU 31 in a digital circuit 3. The digital circuit 3 includes, in addition to the CPU 31, a program storage ROM 32, a data storage RAM 33, and an input/output control circuit 34 for transferring and receiving data to and from a modulator/demodulator circuit 41 in an analog circuit 4. The CPU 31, the ROM 32, the RAM 33, and the input/output control circuit 34 are coupled to each other by a bus S. An antenna circuit 42 is provided in the analog circuit 4 for converting an electrical signal from the modulator/demodulator circuit 41 into a radio wave 91 for transmitting data to the external device. The antenna circuit 42 also receives data in the form of a radio wave 92 from the external device. An internal power supply battery 6 continuously supplies operating current to the oscillator circuit 1, the digital circuit 3, and the analog circuit 4, via lines 51, 52, and 53.
Now, the operation of the conventional non-contact IC card of Figure 1 is described.
Operating current is continuously supplied from the battery 6 to the oscillator circuit 1, the digital circuit 3, and the analog circuit 4. External data to be applied to the non-contact IC card 10 is received in the form of a radio wave 92 by the antenna circuit 42. The antenna circuit 42 converts the received wave into an electrical signal S E and applies it to the modulator/ demodulator circuit 41. The modulator/demodulator circuit.41 demodulates the signal S E to a digital data signal SD' which is applied to the input/output control circuit 34. An output data signal from the input/output control circuit 34 is applied via the bus 5 to the CPU 31, which reads the output data signal applied to it for causing a required operation to be executed.
For transmission of data from the non-contact IC card 10 to the external device, a data signal from the CPU 31 is fed via the bus 5 to the input/output control circuit 34, which, in response to the received data signal, applies a digital data signal S D' to the modulator/demodulator circuit 41. The modulator/demodulator circuit 41 modulates a carrier with the digital data signal S D' to produce a modulated electrical signal S E' and sends it to the antenna circuit 42. The antenna circuit 42 converts the modulated signal received from the modulator/demodulator circuit 42 into a radio wave 91 for transmission to the external device. Thus, through the transmission of the wave 91 and the reception of the wave 92, the non-contact IC card 10 can transmit and receive data to and from the external device.
With the above-described arrangement of the conventional non-contact IC card 10, current is continuously supplied from the battery to all of the circuits including the oscillator circuit 1, the digital circuit 3 and the analog circuit 4, even in the standby mode of operation during which the antenna circuit 42 is neither transmitting the wave 91 nor receiving the wave 92, and, therefore, large power from the battery 6 is consumed, which disadvantageously causes the life of the battery 6 to be short.
Japanese Published Patent Application No. HEI 1-206422 discloses a "portable information device" in which power consumption in a standby mode is reduced. In this portable information device, an operating voltage applied to each circuit is decreased in the standby mode, and the operating voltage to the respective circuits is raised to its nominal value for the normal mode of operation of the device. In this portable information device, however, the application of the operating voltage is not controlled by an external signal, and, even in the standby mode of operation, an operating voltage, although it is -2 low, is supplied to the circuits- Thus, reduction of the power consumption is not sufficient.
Japanese Published Patent Application No. SHO 63-58524 discloses an IC card in which in a standby mode, first clock generating means is operated to generate a lower frequency clock, and in response to a key input or to an external signal input, second clock generating means is enabled to generate a nominal higher frequency clock. Thus, the power consumption in the standby operation mode is reduced. In this IC card, too, because a clock, though it is at a lower frequency, is generated in the standby mode, the reduction of power consumption as a whole is not sufficient. Furthermore, in this IC card, even in the standby mode, an operating voltage is continuously supplied to an analog circuit in the IC card, which causes large power to be consumed from an internal battery.
Japanese Published Patent Application No. SHO 62-34292 shows an IC card which comprises an internal switch circuit. The internal switch circuit is turned on in response to an optical signal applied thereto from an external read-out device to cause an operating voltage to be applied from an internal battery to internal circuits, such as a control unit and a memory unit, within the card- Reduction of power consumption in a standby mode may be achieved in this IC card, but, even in case that the external device operates abnormally, the IC card may respond to the reception of an optical signal from the external device so that the internal battery continues to supply the operating voltage to the respective internal circuits, and, thus, power is wasted.
According to the present invention, a non-contact IC card is provided, in which, not only when the IC card is in the standby mode of operation during which data transfer between the IC card and the external device is not performed, but also when the external device is in abnormal operation so that data transfer is abnormal or data itself is abnormal, the operation of various units of the IC card is inhibited to thereby reduce power consumption.
SUMMARY OF THE INVENTION
According to the present invention, a non-contact IC card comprises a clock oscillator circuit, digital circuitry including, in addition to a CPU, an ROM and an RAM, and analog circuitry including an antenna circuit through which data is transferred between the IC card and an external device, a data modulator/ demodulator circuit and a trigger signal demodulating circuit. In a standby mode of operation, the CPU provides a command to inhibit a clock from being applied to circuits in the digital circuitry and/or to inhibit an operating voltage from being applied to part of the analog circuitry, to thereby reduce power consumption- When it becomes necessary to transfer data to and from the external device, received data is demodulated in the trigger signal demodulating circuit to produce a trigger signal which triggers the application of the clock to given circuits in the digital circuitry and also the resumption of the application of the operating voltage to the entire analog circuitry.
For data transfer between the non-contact IC card according to the present invention and the external device, the internal clock is enabled in the CPU and, at the same time, an operating voltage is supplied to the entire analog circuitry. In the standby operation mode, in response to a command given by the CPU, the clock is disabled in the CPU, or/and the application of an operating voltage to the analog circuitry, except for the circuits necessary for generating a trigger signal, i.e. the antenna circuit and the trigger signal demodulating circuit, is inhibited, whereby power consumed during the operation in the standby mode can be reduced- BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 schematically shows the entire structure of a conventional noncontact IC card:
Figure 2 schematically shows the entire structure of a noncontact IC card according to the present invention; Figure 3 shows connection between an oscillator circuit and a clock circuit in digital circuitry of the non-contact IC card of Figure 2 to which the present invention relates; and Figure 4 is a flow chart for use in explaining the operation of the non- contact IC card of Figure 2.
DESCRIPTION OF PREFERRED EMBODIMENT
A non-contact IC card according to the present invention is described with reference to Figures 2-4.
In Figure 2, a non-contact IC card 20 according to the present invention is shown. An oscillator circuit 1 generates a clocking oscillation signal 2. The oscillation signal 2 is supplied to a CPU 1 in digital circuitry 3. The CPU 1 is coupled to a bus 5 to which an ROM 32 for storing programs, an RAM 33 for storing data, and an input/output control circuit 34 are coupled. Analog circuitry 4 comprises an antenna circuit 42 through which data is transmitted and received in the form of radio waves 91 and 92 to and from an external device, a modulator/demodulator circuit I 41 which sends or receives an electrical signal S E or S. to and from the antenna circuit 42, and a trigger signal demodulating circuit 43 which receives the electrical signal S E generated by the antenna circuit 42 in response to the received wave 92 and generates a trigger signal S T' The trigger signal S T is applied to the CPU 31 for controlling an internal clock inhibit circuit in the CPU 31, which will be described later, and also a switching circuit 11 in a power supply line 53 by which an operating voltage is supplied from a battery 6 to the analog circuitry 4. The battery 6 provides an operating voltage to the oscillator circuit I through a line 51, to the digital circuitry 3 through a line 52 and to the analog circuitry 4 through the line 53 and the switching circuit 11.
Figure 3 is a schematic diagram showing the CPU 31, the ROM 32, the RAM 33 and the input/output control circuit 34-in the digital circuitry 3, and part associated with them. In Figure 3, the clocking oscillation signal 2 from the oscillator circuit 1 is applied to a frequency divider circuit 35 in the CPU 31, where it is appropriately frequency-divided and applied to the internal clock inhibit circuit 36.
In the standby mode of operation, the internal clock inhibit circuit 36 responds to a command from the CPU 31 by inhibiting the internal clock from being applied to internal circuits of the CPU 31, the ROM 32, the RAM 33 and the input/output control circuit 34. In the standby mode, the switching circuit 11 in the line 53 through which an operating voltage V cc is applied to the analog circuitry 4 from the battery 6 is turned off also in response to a command from the CPU 31 so that the application of the operating voltage V cc to the analog circuitry 4 is inhibited. It should be noted, however, that an operating voltage is continuously applied to that circuit portion of the analog circuitry 4 which receives the wave 92 and generates the trigger signal S T' such as the antenna circuit 2 and the trigger signal demodulating circuit 43- Now, the operation of the non-contact IC card of the present invention is described with reference to the flow chart of Figure 4- When the IC card 20 in the standby mode receives a wave 92 and the antenna circuit 42 generates an electrical signal S E' the trigger signal demodulating circuit 43 demodulates the electrical signal S E to generate a trigger signal S T (Step Sl).
The trigger signal S T is applied to the internal clock inhibit circuit 36 through a trigger line 60 to turn on the circuit 36 to permit the clock to be provided to the various internal circuits of the CPU 31 through a clock line 61, whereby the operation of the CPU 31 is initiated. At the same time, the clock is also applied through a clock line 62 to the ROM 32, RAM 33 and the input/output control circuit 34. Thus, the digital circuitry 3 is placed in the operating state (Step S2).
The trigger signal S T is applied also to the switching circuit 11 directly (as indicated by an arrow with a denotation "S T" attached to it in Figure 2) or via the CPU 31 to turn on the switching circuit 11 so that an operating voltage is.applied to the whole analog circuitry 4, and, therefore, the analog circuitry 4 is placed in its operating state (Step S3).
The antenna circuit 42 in the analog circuitry 4 receives the radio wave 92 from the external device and converts it into the electrical signal S E for application to the modulator/ demodulator circuit 41. The modulator/demodulator circuit 41 demodulates the electrical signal S E to generate a digital data signal S D representative of input data and applies it to the input/output control circuit 34 in the digital circuitry 3. The input/output control circuit 34 generates a data signal in response to the digital data signal S D and applies the data signal to the bus 5. The CPU 31 reads the data signal, executes a predetermined operation in accordance with the data signal, and sends a predetermined data signal, which is to be transmitted to the external device, to the input/output control circuit 34 via the bus 5. The input/output control 'circuit 34 converts the data signal into a digital signal S D' and applies it to the modulator/demodulator circuit 41. The modulator/demodulator circuit 41 modulates a carrier with the digital signal S D' to produce a modulated electrical signal S E'' which is applied to the antenna circuit 42. The antenna circuit 42 converts the modulated electrical signal S E' into a radio wave 91 and transmits it to the external device. Thus, transfer of data from the non-contact IC card 20 to the external device and from the external device to the non-contact IC card 20 are carried out by the transmission and reception of the waves 91 and 92 (Step S4).
The CPU 31 makes a judgment as to whether the data transfer between the IC card 20 and the external device is being performed normally or not or whether data itself is correct or not (Step S5). If the judgment is YES, the CPU 31 performs predetermined processing (Step S6) and applies the result of the processing to the input/output control circuit 34. The input/output control circuit 34 applies the digital data signal S D' to the modulator/ demodulator circuit 41, which, in turn, provides the modulated electrical signal S E' to the antenna circuit 42. The antenna circuit 42 sends data representative of the result of the processing to the external device in the form of the radio wave 91 (Step S7).
When a predetermined data transfer between the IC card 20 and the external device is completed, the CPU 31 sends a command to turn off the switching circuit 11 so as to inhibit the operating voltage V cc from being applied to the circuit portion of the analog circuitry 4, except the antenna circuit 42 and the trigger signal demodulating circuit 43, and, at the same time, the internal clock inhibit circuit 36 within the CPU 31 is turned off so as to inhibit the application of the clock to the internal circuits of the CPU 31, the ROM 32, RAM 33 and the input/output control circuit 34 (Step S8). Thus, the non-contact IC card 20 returns to its standby state.
If the Judgment in the Step S5 is NO, i.e- if it is judged that there is something wrong in the data transfer, such as data being inappropriately transferred or inappropriate data being transferred, the CPU 31 performs error processing (Step S9), and the processing is jumped directly to a Step 8 to turn off the internal clock inhibit circuit 36 within the CPU 31 so that the application of the clock to the various parts of the digital circuitry 3 is inhibited and, at the same time, the switching circuit 11 is also turned off to inhibit the application of the operating voltage to the circuit portion of the analog circuitry 4 except for the antenna circuit 42 and the trigger signal demodulating circuit 43.
Although the operating voltage V cc is being continuously applied to the digital circuitry, its power consumption is significantly reduced when the application of the clock thereto is inhibited, because, in a digital circuitry, a large current flows essentially at rising and falling edges of a clock signal and, substantially no current flows when the application of the clock signal is inhibited and, therefore, there is no state change.
The IC card 20 has been described to be coupled to the external device by means of a radio wave, but the present invention can provide the same results if it is applied to an IC card which is coupled by a medium other than radio waves, such as light and ultrasonic waves- The digital circuitry 3 and the analog circuitry 4 may be in the form of an LSI on the same chip or may be IC's on separate chips.
Furthermore, although in the described embodiment, the internal clock within the CPU 31 is inhibited when no data transfer is done between the IC card and the external device, the oscillator circuit 1 may be disabled instead. In this case, the oscillator circuit 1 is enabled by the trigger signal S T which is applied to the oscillator circuit 1 via a trigger line 60' indicated by a dotted line in Figures 2 and 3.
As described, according to the present invention, in the standby mode of operation of the non-contact IC card during which data transfer between the card and the external device is not performed, (A) the application of the clock to various portions of the digital circuitry or (B) the application of the operating voltage to portions of the analog circuitry is inhibited, or (C) both the application of the clock and the application of the operating voltage are inhibited, power consumed in the standby mode is significantly reduced so that the life of the battery in the IC card is extended. In addition, since the operating voltage is continuously applied to the digital circuitry 3 even after the inhibition of any of the above-described (A), (B) and (C) is performed, there is no fear that the stored information in the CPU 31, the ROM 32 and the RAM 33 would be lost. Furthermore, when there is any abnormal condition in the data transfer between the IC card and the external device, the CPU 31 provides a command to prevent the non-contact IC card from wasting power.

Claims (8)

What is Claimed is:
1. A non-contact IC card comprising: an oscillator circuit for providing a clock; digital circuitry, including at least a CPU, an ROM and an RAM, operated in response to the clock provided by said oscillator circuit; analog circuitry coupled to said digital circuitry for transmitting and receiving data to and from an external device without contacting said external device; and an internal power supply battery for providing an operating voltage to said oscillator circuit, said digital circuitry and said analog circuitry; wherein said non-contact IC card further comprises an internal clock inhibit circuit which inhibits the application of said clock to said digital circuitry in accordance with a command provided by said CPU when said non-contact IC card is in a standby mode of operation in which neither transmission nor reception of data to and from said external device is done, and which permits the application of the clock to said digital circuitry when said analog circuitry receives data from said external device.
2. A non-contact IC card according to Claim 1 wherein, when said IC card is in the standby mode of operation in which neither transmission nor reception of data to and from said external device is done, said oscillator circuit continues to operate, while the application of the clock to said digital circuitry is inhibited in accordance with a command given by said CPU.
3. A non-contact IC card according to Claim 1 wherein, when said IC card is in the standby mode of operation in which neither transmission nor reception of data to and from said external device is done, the oscillation of said oscillator circuit is inhibited in accordance with a command given by said CPU.
4. A non-contact IC card comprising: an oscillator circuit for providing a clock; digital circuitry, including at least a CPU, an ROM and an RAM, operated in response to the clock provided by said oscillator circuit; analog circuitry coupled to said digital circuitry for transmitting and receiving data to and from an external device without contacting said external device; and an internal power supply battery for providing an operating voltage to said oscillator circuit, said digital circuitry and said analog circuitry; wherein said non-contact IC card further comprises a switching circuit which inhibits the application of the operating voltage from said battery to part of said analog circuitry in accordance with a command given by said CPU when said IC card is in a standby mode of operation in which neither transmission nor reception of data to and from said external device is done, and which permits the application of the operating voltage to said analog circuitry when said analog circuitry receives data from said external device.
5. A non-contact IC card comprising: -an oscillator circuit for providing a clock; digital circuitry, including at least a CPU, an ROM and an RAM, operated in response to the clock provided by said oscillator circuit; analog circuitry coupled to said digital circuitry for transmitting and receiving data to and from an external device without contacting said external device; and an internal power supply battery for providing an operating voltage to said oscillator circuit, said digital circuitry and said analog circuitry; wherein said non-contact IC card further comprises: an internal clock inhibit circuit which inhibits the application of said clock to said digital circuitry in accordance with a command provided by said CPU when said non-contact IC card is in a standby mode of operation in which neither transmission nor reception of data to and from said external device is done, and which permits the application of the clock to said digital circuitry when said analog circuitry receives data from said external device; and a switching circuit which inhibits the application of the operating voltage from said battery to part of said analog circuitry in accordance with a command given by said CPU when said IC card is in said standby mode of operation, and which permits the application of the operating voltag6 to said analog circuitry when said analog circuitry receives data from said external device.
6. A non-contact IC card according to Claim 5 wherein said analog circuitry includes an antenna circuit through which transmission and reception of data to and from said external device are done, and a trigger signal demodulating circuit for generating a trigger signal for controlling said CPU; and wherein when said IC card is in said standby mode of operation, the application of the operating voltage to said antenna circuit and said trigger signal demodulating circuit is continued, while the application of the operating voltage to said analog circuitry excluding said antenna circuit and trigger signal demodulating circuit is inhibited.
7. A non-contact IC card according to Claim 5 wherein, when said IC card is in the standby mode of operation in which neither transmission nor reception of data to and from said external device is done, said oscillator circuit continues to operate, while the application of the clock to said digital circuitry is inhibited in accordance with a command given by said CPU.
8. A non-contact IC card according to Claim 5 wherein, when said IC card is in the standby mode in which neither transmission nor reception of data to and from said external device is done, the oscillation of said oscillator circuit is inhibited in accordance with a command given by said CPU.
Published 199 1 at The Patent Office. Concept House. Cardiff Road. Newport. Gwent NP9 I RH. Further copies ruay be obtained fron' Sales Branch. Unit 6. Nine Mile Point, CwnifeWach, Cross Keys. Newport. NP1 7HZ. Printed by Multiplex techniques'ltd. St Marv Cray Kent.
GB9024781A 1990-07-03 1990-11-14 Non-contact IC card Expired - Fee Related GB2245725B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2178003A JP2822624B2 (en) 1990-07-03 1990-07-03 Non-contact IC card

Publications (3)

Publication Number Publication Date
GB9024781D0 GB9024781D0 (en) 1991-01-02
GB2245725A true GB2245725A (en) 1992-01-08
GB2245725B GB2245725B (en) 1994-08-31

Family

ID=16040853

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9024781A Expired - Fee Related GB2245725B (en) 1990-07-03 1990-11-14 Non-contact IC card

Country Status (4)

Country Link
US (1) US5212373A (en)
JP (1) JP2822624B2 (en)
FR (1) FR2664406B1 (en)
GB (1) GB2245725B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2689707A1 (en) * 1992-04-02 1993-10-08 Hamel Dominique Data receiving and transmitting device using radio channel - has command unit to control supply of electric power to units w.r.t. detection of radio signal
EP0569131A2 (en) * 1992-04-07 1993-11-10 Mitsubishi Denki Kabushiki Kaisha IC card
EP0691625A1 (en) * 1993-07-06 1996-01-10 AT&T Corp. A portable radio frequency enclosure for a smart card
WO1996038814A2 (en) * 1995-06-02 1996-12-05 Philips Electronics N.V. Chip-card
EP1643655A1 (en) * 2003-07-08 2006-04-05 Fujitsu Limited Communication terminal device, power supply method, and power supply program

Families Citing this family (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK174975B1 (en) * 1988-05-06 2004-04-05 Toppan Printing Co Ltd Integrated circuit board
ES2095268T3 (en) * 1991-04-23 1997-02-16 Siemens Ag INSTALLATION FOR DATA TRANSMISSION AND ENERGY WITHOUT CONTACT.
CA2087611C (en) * 1991-05-22 1996-09-17 Yoshinori Kobayashi Non-contact type ic card
DE4133246C1 (en) * 1991-10-08 1993-04-08 Smartdiskette Gmbh, 6270 Idstein, De
JPH0528330A (en) * 1991-07-24 1993-02-05 Mitsubishi Electric Corp Non-contact type portable carrier and its initializing method
JP2747395B2 (en) * 1992-07-20 1998-05-06 三菱電機株式会社 Non-contact IC card, non-contact IC card reader / writer, and data transmission method
CA2147824A1 (en) * 1992-10-26 1994-05-11 Johannes Marinus George Bertina Host and user transaction system
US6058497A (en) * 1992-11-20 2000-05-02 Micron Technology, Inc. Testing and burn-in of IC chips using radio frequency transmission
US5983363A (en) * 1992-11-20 1999-11-09 Micron Communications, Inc. In-sheet transceiver testing
JPH0721336A (en) * 1993-07-05 1995-01-24 Mitsubishi Electric Corp Contact type portable equipment and non-contact type portable equipment
US6145739A (en) * 1993-10-26 2000-11-14 Intellect Australia Pty Ltd. System and method for performing transactions and an intelligent device therefor
US5484997A (en) * 1993-12-07 1996-01-16 Haynes; George W. Identification card with RF downlink capability
US5557516A (en) * 1994-02-04 1996-09-17 Mastercard International System and method for conducting cashless transactions
US5907597A (en) 1994-08-05 1999-05-25 Smart Tone Authentication, Inc. Method and system for the secure communication of data
US5583933A (en) * 1994-08-05 1996-12-10 Mark; Andrew R. Method and apparatus for the secure communication of data
JP3526928B2 (en) * 1994-11-15 2004-05-17 株式会社ルネサスＬｓｉデザイン Non-contact IC card system
JP2907048B2 (en) * 1995-02-17 1999-06-21 株式会社デンソー Mobile communication roadside unit, mobile communication mobile unit, and mobile communication system
US5671271A (en) * 1995-05-25 1997-09-23 Henderson; Daniel A. Dialer programming system and device with integrated printing process
US5704046A (en) * 1996-05-30 1997-12-30 Mastercard International Inc. System and method for conducting cashless transactions
JP3392016B2 (en) * 1996-09-13 2003-03-31 株式会社日立製作所 Power transmission system and power transmission and information communication system
SG54559A1 (en) 1996-09-13 1998-11-16 Hitachi Ltd Power transmission system ic card and information communication system using ic card
US5812942A (en) * 1996-09-24 1998-09-22 Motorola, Inc. Balanced differential radio receiver and method of operation
US5815020A (en) * 1996-09-24 1998-09-29 Motorola, Inc. Balance differential receiver
JP3960645B2 (en) * 1996-12-27 2007-08-15 ローム株式会社 Circuit chip mounted card and circuit chip module
CA2200675C (en) * 1997-03-21 2003-12-23 Chen Wu A printed antenna structure for wireless data communications
JP3729591B2 (en) * 1997-04-09 2005-12-21 株式会社ルネサステクノロジ Storage device and data reception control method when clock oscillation is stopped
US6119255A (en) 1998-01-21 2000-09-12 Micron Technology, Inc. Testing system for evaluating integrated circuits, a burn-in testing system, and a method for testing an integrated circuit
IL123949A (en) * 1998-04-03 2001-07-24 On Track Innovations Ltd Data transaction card having extended range
NZ514367A (en) * 1999-03-02 2003-05-30 Konisa Ltd Identification system
US6845249B1 (en) * 1999-05-24 2005-01-18 Sierra Wireless, Inc. Analog test output switchably connected to PCMCIA connector pin
US6714121B1 (en) * 1999-08-09 2004-03-30 Micron Technology, Inc. RFID material tracking method and apparatus
WO2002001521A1 (en) * 2000-06-28 2002-01-03 G. Holdings Ltd. Transaction system with portable personal device for transaction identification and control
JP3923715B2 (en) 2000-09-29 2007-06-06 株式会社東芝 Memory card
US6472747B2 (en) * 2001-03-02 2002-10-29 Qualcomm Incorporated Mixed analog and digital integrated circuits
WO2002075674A2 (en) * 2001-03-16 2002-09-26 G. Holdings Ltd. System and method for replacing identification data on a portable transaction device
MXPA03007781A (en) * 2001-03-16 2003-12-08 Holdings Ltd G System and method for replacing identification data on a portable identification device.
KR100450765B1 (en) 2002-10-11 2004-10-02 한국전자통신연구원 Wireless communication medium and method for operation thereof
KR100479340B1 (en) * 2002-12-09 2005-03-31 한국전자통신연구원 Smart card for controlling a system clock and method therefor
DE10334398B4 (en) * 2003-07-28 2008-04-03 Siemens Ag Method for reducing the power consumption of a mobile data memory, application of the method in an identification system with at least one read / write device and a mobile data memory
JP2005136662A (en) * 2003-10-30 2005-05-26 Matsushita Electric Ind Co Ltd Radio communication system, portable terminal equipment, server device, memory card, and program
US7163155B2 (en) * 2003-11-05 2007-01-16 Interdigital Technology Corporation ASIC-embedded switchable antenna arrays
WO2005060700A2 (en) * 2003-12-18 2005-07-07 Altierre Corporation Low power wireless display tag systems and methods
JP4463574B2 (en) * 2004-01-23 2010-05-19 株式会社リコー IC tag reader / writer and apparatus having IC tag reader / writer
KR101103263B1 (en) * 2004-10-20 2012-01-11 삼성전자주식회사 Integrated circuit card for reducing power consumption
EP1688847B1 (en) * 2005-02-03 2011-05-04 Texas Instruments Incorporated Die-to-die interconnect interface and protocol for stacked semiconductor dies
US8077012B2 (en) * 2006-06-16 2011-12-13 Intelleflex Corporation RFID device with first clock for data acquisition and/or calibration of second clock
US7667549B2 (en) 2007-04-26 2010-02-23 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device and driving method thereof
US7913903B1 (en) 2007-11-19 2011-03-29 Jpmorgan Chase Bank, N.A. System and method for granting access to a restricted access area using an approved list
EP2518587B1 (en) * 2011-04-05 2015-06-10 Nxp B.V. Management of secure element deadlock
CN104143969B (en) * 2013-05-08 2017-02-08 博通集成电路（上海）有限公司 Sleep mode circuit and method for making circuit be in sleep mode
US10129754B2 (en) 2016-08-31 2018-11-13 Bank Of America Corporation Real time digital issuance of resources
US11150712B2 (en) 2019-04-30 2021-10-19 International Business Machines Corporation Smart controller with phantom inductor current sensing for switched mode power supplies

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6234292A (en) * 1985-08-08 1987-02-14 Koito Ind Co Ltd Ic card device
JPS62237592A (en) * 1986-04-08 1987-10-17 Casio Comput Co Ltd Clock switching system for ic card
JPH07121630B2 (en) * 1987-05-30 1995-12-25 株式会社東芝 IC card
JPH0736141B2 (en) * 1988-02-12 1995-04-19 セイコー電子工業株式会社 Low power portable information device
JPH025192A (en) * 1988-06-24 1990-01-10 Oki Electric Ind Co Ltd Ic card reader/writer device
JP3028815B2 (en) * 1988-08-19 2000-04-04 株式会社東芝 Transmission method of portable electronic device and portable electronic device
JPH0755593B2 (en) * 1989-05-18 1995-06-14 三菱電機株式会社 Non-contact IC card
JP2723296B2 (en) * 1989-06-06 1998-03-09 株式会社東芝 Portable media
JP2645163B2 (en) * 1990-03-13 1997-08-25 三菱電機株式会社 Non-contact IC card
US5036461A (en) * 1990-05-16 1991-07-30 Elliott John C Two-way authentication system between user's smart card and issuer-specific plug-in application modules in multi-issued transaction device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2689707A1 (en) * 1992-04-02 1993-10-08 Hamel Dominique Data receiving and transmitting device using radio channel - has command unit to control supply of electric power to units w.r.t. detection of radio signal
EP0569131A2 (en) * 1992-04-07 1993-11-10 Mitsubishi Denki Kabushiki Kaisha IC card
EP0569131A3 (en) * 1992-04-07 1993-12-15 Mitsubishi Electric Corp Ic card
US5365047A (en) * 1992-04-07 1994-11-15 Mitsubishi Denki Kabushiki Kaisha IC card with clock signal input control
EP0691625A1 (en) * 1993-07-06 1996-01-10 AT&T Corp. A portable radio frequency enclosure for a smart card
WO1996038814A2 (en) * 1995-06-02 1996-12-05 Philips Electronics N.V. Chip-card
WO1996038814A3 (en) * 1995-06-02 2002-05-30 Philips Electronics Nv Chip-card
EP1376460A1 (en) * 1995-06-02 2004-01-02 Koninklijke Philips Electronics N.V. Chip card
CN1329869C (en) * 1995-06-02 2007-08-01 皇家菲利浦电子有限公司 Chip-card
EP1643655A1 (en) * 2003-07-08 2006-04-05 Fujitsu Limited Communication terminal device, power supply method, and power supply program
EP1643655A4 (en) * 2003-07-08 2007-11-28 Fujitsu Ltd Communication terminal device, power supply method, and power supply program

Also Published As

Publication number Publication date
GB9024781D0 (en) 1991-01-02
JPH0464189A (en) 1992-02-28
JP2822624B2 (en) 1998-11-11
GB2245725B (en) 1994-08-31
FR2664406A1 (en) 1992-01-10
FR2664406B1 (en) 1993-07-23
US5212373A (en) 1993-05-18

Similar Documents

Publication Publication Date Title
US5212373A (en) Non-contact ic card
EP0887990B1 (en) Modem unit
US5734585A (en) Method and apparatus for sequencing power delivery in mixed supply computer systems
JP2549192B2 (en) Non-contact IC card and method of using the same
EP0492482B1 (en) Non contact type IC-card
JP2002007000A (en) Electronic equipment
US6018802A (en) Communication apparatus having power backup function for image memory
JP4220210B2 (en) Remote control system
US6140714A (en) Power control apparatus for a battery-powered communication system
US5842121A (en) Power supply unit with switch-on/off facility for powering radio equipment
EP0750247B1 (en) Data processing apparatus connectable to an information processing terminal via an interface
JPH0855198A (en) Noncontact ic card
KR0154711B1 (en) The energy saving equipment by power-off mode for a printer
JPH10269327A (en) Control circuit
US5569965A (en) Control method for reducing quiescent current
JP2501384B2 (en) IC card
US6115588A (en) Radio selective calling receiver having infrared data transmission
JP2007080027A (en) Control system, controller and control method of control system
JP3397500B2 (en) Facsimile machine
JPH06124368A (en) Noncontact medium
KR0135742Y1 (en) Power saving device for image display apparatus
JPH08221148A (en) Information processor
JPH08221158A (en) Power supply circuit
JP2002027565A (en) Power source circuit
JPH06311269A (en) Facsimile equipment

Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 19951026

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20091114